A070932 - OEIS

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A070932

Possible number of units in a ring.

1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`By considering the ring Z_n and the finite fields GF(q) this sequence contains the values of Euler function (A000010) and prime powers - 1 . By taking direct products if n and m belong to the sequence so is m*n.`
	CROSSREFS	`Cf. A000010, A000961.` `Sequence in context: A175439 A048264 A141825 * A161577 A093686 A155763` `Adjacent sequences: A070929 A070930 A070931 * A070933 A070934 A070935`
	KEYWORD	`nonn`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), May 24 2002`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.